The chronic recurrent mumps were previously referred to as chronic suppurative mumps, which includes chronic obstructive mumps, and are more common clinically, occurring in both children and adults, but their regression is very different. Some patients also present clinically with unilateral swelling of the parotid gland, but parotid angiography shows dilated terminal ducts in both parotid glands. These phenomena suggest that there may be congenital abnormalities in the development of the gland, which may be a potential pathogenic factor. 2. Immunocompromised immune system in childhood is immature and immunocompromised, which makes retrograde infections easy to occur. The immune system of the child can be cured after maturity. Many children have parotid swelling episodes associated with upper respiratory tract infections and inflammatory lesions in the oral cavity, where bacteria are retrogradely infected through the parotid ducts. Adult recurrent mumps is the result of a delayed cure of recurrent mumps in children. Clinical manifestations: Recurrent mumps in children can occur from infancy to 15 years of age, but is most common around 5 years of age. The onset of mumps can be sudden or gradual, slightly more in males than females. The swelling is less pronounced than in mumps, with only mild edema and flushed skin. The skin may be flushed. Individual children present with parotid masses, mostly inflammatory infiltrates. Squeezing the gland reveals pus or jelly-like fluid overflowing from the ductal orifice, and a few have abscess formation. Most last about a week. The resting phase is mostly uncomfortable, and the parotid secretion is occasionally cloudy on examination. The interval between attacks varies from weeks to months. The younger the age, the shorter the interval and the more likely it is to recur. As the age of the patient increases, the intervals are longer and the duration is shorter. Diagnosis and differential diagnosis: The diagnosis is based on clinical manifestations and parotid imaging. The child has recurrent bilateral or unilateral swelling of the parotid gland with pus or jelly-like discharge from the duct opening. The number of episodes decreases with age and the symptoms diminish, and most of them heal after puberty. Parotid angiography shows punctate or bulbous dilatation of the terminal ducts and delayed emptying, with no significant abnormalities in the dominant ducts or intraglandular ducts. In patients with unilateral parotid swelling, bilateral parotid angiograms should be performed in about half of the patients, as they show punctate dilatation of the terminal ducts of the parotid gland. Recurrent mumps in children needs to be differentiated from mumps. Mumps often occurs bilaterally, with fever and more pronounced swelling, and normal parotid ductal secretion. Recurrent mumps in adults needs to be differentiated from secondary infection with Schelgren’s syndrome. The latter is usually seen in middle-aged women with no history of childhood onset, often with dry mouth, dry eyes, and autoimmune disease. Parotid angiography reveals dilated and irregular dominant ducts with gross margins and onion skin or lace-like changes. Treatment: Recurrent parotitis is self-healing, so the principle is to strengthen resistance, prevent secondary infection and reduce seizures. Patients are advised to drink more water, massage the gland daily to help empty the saliva, and rinse the mouth with light salt water to maintain oral hygiene. Chew sugar-free chewing gum to stimulate saliva secretion. If acute inflammation is present, antibiotics can be used. Parotid angiography itself has a therapeutic effect on recurrent parotitis. If recurrence is frequent, thymidine can be injected intramuscularly to regulate immune function. One injection every other day, 10 times as a course of treatment, 2 courses of treatment per year.